OAS or Oas may refer to:

Chemistry

  • O-Acetylserine, amino-acid involved in cysteine synthesis

Computers

  • Open-Architecture-System, the main user interface of Wersi musical keyboards
  • OpenAPI Specification (originally Swagger Specification), specification for machine-readable interface files for RESTful Web services
  • Oracle Application Server, software platform

Medicine

  • Open aortic surgery, surgical technique
  • Oral allergy syndrome, food-related allergic reaction in the mouth
  • 2'-5'-oligoadenylate synthase, an enzyme
  • OAS1, OAS2, OAS3, anti-viral enzymes in humans

Organizations

  • Office of Aviation Services, agency of the United States Department of the Interior
  • Ontario Archaeological Society, organization promoting archaeology within the Province of Ontario, Canada
  • Organisation Armée Secrète, French far-right paramilitary group, active during the Algerian War (1954–1962), fighting against Algerian independence
  • Organization of American States, continental organization of the Western Hemisphere
  • Oxford Art Society, society for artists in the city of Oxford, England

Transport

  • Oasis LRT station, Singapore, LRT station abbreviation OAS

Other

  • Ohio Auction School, school for auctioneers in Ohio, U.S.
  • Old Age Security, social security payment available to most Canadians aged 65 or older
  • Option-adjusted spread, the yield-curve spread of a fixed-income security, adjusted for the cost of embedded options
  • Oas, Albay, municipality in the Philippines

See also

  • Oaş (disambiguation)